A single ticket costs € 1.20 ( US$ 1.30). If you purchase the Porto Card or the Andante Tour Card, you'll have unlimited access to the city's metro system.
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You should plan to spend around €126 ($136) per day on your vacation in Porto, which is the average daily price based on the expenses of other visitors. Past travelers have spent, on average, €36 ($39) on meals for one day and €21 ($22) on local transportation.
There are many steep hills in Porto, so expect a lot of uphill walking. The steepest hill of the route is just before the Santo Ildefonso church (21), and depending on your energy levels, this may be a convenient location to end the walking tour.